TY - JOUR T1 - Risks of venous thromboembolism with various hormonal contraceptives JF - Canadian Family Physician JO - Can Fam Physician SP - 1097 LP - 1097 VL - 58 IS - 10 AU - G. Michael Allan AU - Sudha Koppula Y1 - 2012/10/01 UR - http://www.cfp.ca/content/58/10/1097.abstract N2 - ER -